Apparatus for scribing instruments



R. P. CHANFRAU APPARATUS FOR SCRIBING INSTRUMENTS Sept. 27, 1949.

Filed Sept. 13, 1944 6 o M a v m 3 Patented Sept. 27, 1949 UNITED-f:;S;TATES PATENT; OFFICE :i: "2" i. V K 4 2 I r V APPARATUS FOR SCRIBIINGINSTRUMENTS j I I 7 Ralph P. Chanfrau, Phoebus, Va." Application September is, 1944, Serial No. 553,857

v y i g a Claimsa (01. 33-75) (Granted under'the act of M rch i883,

The'invention described herein may be manufactured and used byor forthej Government for the payment to amended April 39, 1928; 370 0. G. 757) arranging the templet tangent to its circular guide line-or arrangingthexletters so that their center line would pass through the-center of curvature of .theirxarcof alignment. .To facilitate accurate struments for arranging letters in arcuate align- A ment, but more particularly to a device WhlCh 1s adapted to'be used-in conjunction with a printing instrument wherein-the scriber' is carried by' a body mem ber and isdirected over the surface to be written upon by a tracer pin movable in character grooves formedin a templet and by a tail'pin mov- I ablein a groove parallel to the li-ne'of lettering.

Oneobject of the invention is to provide an easily operated device by. which the templet f the scribing instrument may be placed in various positions on the arc of a circle of any suitable diameter, when'it is desired to arrange the printed letters in arcuate alignment. j

Another object of the invention isto' provide a device of ,the class described which is of simple and sturdy construction, and composed of few parts which may be cheaply manufactured.

Another object of theinve ntion is to provide a device of the class described.whichoc'cupies very little space and which may be easily transported with the scribing instrumentor lettering set.

Other objects and advantages reside in the details of construction and operation as more fully described and claimed hereinafter, reference being had to. the accompanying drawing forming art thereoflwherein like .parts are indicated by similar reference characters, and inwhichf Figure l is a perspectiveviewiof the device showing the position of the .templet in relation thereto when it is desired to arcuately align letters with their bases toward the center of curvature;

Figure 2 is a perspective view of the device showing the position of the templet in relation thereto when it isdesired to'arcuately align letters with their tops toward the center of curvature;

Figure 3 is a top plan view of the device showing the adjustable center plate; and

Figure 4 is an elevation of the device as projected from Figure 3.

Heretofore whenthe operator of a lettering set or scribing instrument as set forth above, desired to align letters in the arc of a circle, it was neceshim to arrange the templet in a plurality of positions in order that the lettering would follow an arcuate contour. To do this accurately a circular line or lines should be drawn to direct the path of the templet or the letters or both. Even with such a careful layout inaccuracies would be prevalent, owing to the difficulties encountered in arcu-ate alignment of the letters, the device set forth herein and which is described in detail below was devised. 1 j t V v Referring to Fig. 1., which illustrates the device in operation, the numeral I0 indicates the sheet of paper which is being printed by means of a scriber i i which is provided with body portion l2 having three arms l3, l4, 15 from which project, respectively, a tracer pin l6 movable in the'oharacter grooves ll in the templet [8, a tail pin l9 movable in groove 2c in the templet parallel to the line of lettering and a pen 2| for inking letters.

The templet which consists of a flat strip of boxwood,cellulose derivative plastic, orother suitable material, has-parallel lateral edges and contains an alphabet outlined bythe grooves l! in the material.

When forming wordsin which the lettersare aligned along a straight line the operator slides the templet l8 along the-side of a triangle or the arm of a T-square,-and prints one letter after another, but;when forming words where the letters are in arcuatealignrnent itis necessary for the operator to lay out curves'and move the'templet tovarious positions 4 asdescribed above. 7

Fig. 1 illustrates the arcuatealignment of let ters by the use of the herein described invention.

The @numeral 22 designates, the entire instrument which is formed of. xylonite or other suitable transparent material, and which comprises a straight edge templet guide portion 23 joined to a V centrally located radial arm by diagonal connecting strips 25. vided with a raised portionadjacent its'outer edge which maybe formed by attaching a strip,

of;xylonite.26 thereon. Thestrip 26'which has parallel longitudinal edges is used as a straight edge for the templet when it is necessary to reverse the position of the letters as shown in Fig. 2 and which will be further described. A center line is inscribed on the lower surface of the guide portion 23 which serves for centering the letter to be printed. 7

The radial arm 24 is provided with a centrally located slotted opening 21 extending to within a short distance of either end thereof. The slot 2? functions as a guide for a sliding member 28. The sliding member 28 comprises an upper longitudinally extending plate 29 and a shorter plate Bflwhich are retained on the upper and lower sides of the radial arm 24 by means of studs 3! which The guide member 23 is pro- 7 edge 23 until the hole 32 is over the space or scribing opening 34 between the straight edge and the radial arm 24 which greatly shortens the radius about which the straight edge'may be turned. For further shortefi'ir'ig of the' 'radius holes 35 are provided along the center line 36 which is marked on the guide portion 23. Thus,

the letters may be aligned in thearcofa Very small circle.

When it is desired to arcuately align letters with their tops toward-"thecenter of curvature, as shown'in Fig. 2, the templt is placed against the' iriner' edge of thefstrip'26 and'the pen 2| is operatedthr ugh the scribing opening 3'4 between the straightedge portion and the radial arm 24. I I

Having thus described my invention, what I claim as new and wish tdscure by Letters Patentisf Y,

1. A device of the character described adapted to be used with a templct-dir'ected 'pantographic scribing instrument ,said device being made of sheet material cut to form' ahead portionhaving a central scribing:opening and'a radial arm connected to said head portion-by diagonal strips, upper and lower straight edges located on said head portion said lower straightedge being formed integral with the head portien of said device, and

said upper straight'edges being formed as parallel edges on 'a stripattaohed to said head' with one of said edges being aligned with the edge formed integral'with the head, saidstraighti' edges being adapted to direct't'h e al gnment of said templet when scribing respectivelyfwithin and outside of said opening, and a nter defining slide member supporting a pivot p n,' s ai'd slidebeing' adjustably connected to Samara andadapted to extend withinsaid scribing opening todefine a predetermined radius for the arcuate movement of said straight edgesfsaid' head portion and said straight edges being drilled along the-center line thereof with a plurality of spaced holes for the reception of said centering pin to define shorter radii for the arcuate location of said straight edge.

2.' A device of the character described adapted to be used with 'a'templet-dire'cted pantographic inscribing instrument, said device being made of sheet material cut and drilled to form a head portion provided with a plurality of centrally located holes adapted to receive a centering pin, and a centrally slotted radial arm connected to said head portions by diagonal strips forming a scribing opening in said head portion, upper and lower straight edges located on said head portion said lower straight edge being formed integral with the head portion of said device, and said upper straight edges being formed as parallel edges on a "s'tripattache'd 'to""saicl head with one of said edges'being alignedwith the edgeformed integral with the head, said straight edges being adapted. to direct the alignment of said templet when scribing"res pectivly within and outside of said opening, and a center defining slide member supporting apiv'otpin, said slide being adjustably connectedifto: said am and adapted to extend within said scribing opening to define a predeteriiiir'idraidius for the arcuate movement of said straight edges? f? V 3. Adevice for the arcuate alignment of characters adapted to be used with a templet-directed pantog'ra'phic scribing instrument, said device be ing" formed or rigid transparent 'sheet'material cut to provide a head portion providedwith a plurality of holes adapted to receive a centering pin, anda radial arm connected tosaid'head portion by diagonal strips, foiming*a"scribing opening thereb'etweeri, upper and lower straight edges" positioned upon said head portion said lower straight edge being formed integral with the head portion of said device,'and saidupper' straight edges being formedas paralle'l edges on a strip attached to saidhead with one of said edges being aligned with'ithe' edgeformed integral with the -head, said straight edges being adapted to direct the alignment of said templet, for the operation of said scribing instrument respectively within said scribingppening and exterior to said head portion, to thereby arcuately align characterswiththeir top portions and bottom portions nearest the'cnter of curvature.

f, RALPH P. CHANFRAU.

,. n R FERE C S CITED The followingreferences are of record in the file-ofrthis patht:t

UNITEhSTATES PATENTS Number" Name 1 Date 637,263 Jacobs Nov. 21, 1899 714,404 Schaller Nov. 25, 1902 1,039,057" Hill Sept. 17, 1912 1,205,687 Verhey Nov. 21, 1916 1,572,237 Hunt Feb. 9, 1926 2;372,288 Odom Mar. 27, 1945 2,389,303 Forslund Nov. 20, 1945 FOREIGN PATENTS Number Country Date 260,211 Great-Britain May 26, 1926 

